Exploratory Subgroup Analytics on Ubiquitous Data -- Personalized Network Activity Feeds: Finding Needles in Haystacks -- Ontology-Enabled Access Control and Privacy Recommendations -- Refining Frequency-Based Tag Reuse Predictions by Means of Time and Semantic Context -- Forgetting the Words but Remembering the Meaning: Modeling Forgetting in a Verbal and Semantic Tag Recommender -- Utilizing Online Social Network and Location-Based Data to Recommend Products and Categories in Online Marketplaces -- Open Smartphone Data for Structured Mobility and Utilization Analysis in Ubiquitous Systems -- Predictability Analysis of Aperiodic and Periodic Model for Long-Term Human Mobility Using Ambient Sensors.